1004 



as there are iiUernervnral cells. Eacli component is prolonged wedge- 

 like in the dii-ection of the wing-root. The extent of this prolongation 

 is individnally different, though in general it may be stated, that 

 in a backward direction toward the hinder wing-edge the dark 

 internervnral spots get larger and more intensively black, this back- 

 ward increase in size and darkness being the only indication of a 

 similaritj' to the eye-spot of ocellata. 



Therefore, though in this latter instance tiliae shows almost as 

 little likeness to oceAlata as does populi, this does not derogate from 

 the truth and the value of the fact, that in numerous Sphingides the 

 hinder external angle of fore- as well as of hind-wing shows a dark 

 pigmentation, wdiich may be differentiated to an eye-spot. This might 

 also 1)6 expressed otherwise, by saying that the above-mentioned 

 posterior triangular spot is not restricted to the fore-wing, but returns 

 on the hind-wing. 



And also on the fore-wing the spot in question may assume the 

 character of an eye-spot, as is shown by several Sphingides belonging 

 to ditFerent genera, e.g. Daphnusa ailanthn. 



On the other hand, as already said, other species possess near to 

 this hinder external angle of the fore-wing only a single or double, 

 solid blotch not differentiated to an eye-spot, eg. Oxijamhulyx 

 canescens. Also this blotch may be repeated on the hind-wing, e.g. 

 SnierintJius querent. 



Among the Sphingides at my disposal P/io/as lahrusine (Fig. 6) 

 seems to me to possess a highly remarkable colour-pattern. On its 

 under side the similarity between fore- and hind-wing is very great, 

 and both show the usual simple design of Lines II and III on a 

 nearly homogeneous faint gieenish-yellow ground, to which only along 

 the external margin a differently coloured area, separated from the 

 rest of the wing-field by a zigzag line, and evidently lepresenting 

 Bar I, is added. But on the upper surface the contrast between the two 

 wing-pairs is very profound. The fore-wings are almost unicolourous 

 dark opaque green, exactly corresponding in hue to the entire body 

 of the moth. Yet several traces of dark transverse lines are well 

 defined, especially the middle-field between Bars III and IV, which 

 is conspicuous by a somewhat darker green shade. But at the external 

 border of this ruiddle-field two square little areas are so to say 

 spared out from the geneial green overshading: one nearly in the 

 centre, the other at the back margin, thereby giving the impression 

 of brown curtains before two low windows in a green wall. That 

 impression is strengthened by the fact, that in these brown areas 

 the curved components of the transverse dark bars are more numerous 



